Planetary scientists are studying a young exoplanet, Kepler-186f, which has an atmosphere rich in carbon dioxide, highly resembling Earth's early atmosphere.
Explain two distinct natural processes that would cause the percentage of carbon dioxide in this planet's atmosphere to decrease significantly over geological time, assuming Earth-like conditions develop.
97 exam-style questions on Edexcel GCSE Chemistry 9.2 Earth and atmospheric science, covering 9.2.1 The Earth's early atmosphere, 9.2.2 How the atmosphere evolved, 9.2.3 Chemical test for oxygen, and 9.2.4 The greenhouse effect and climate change. Each one has a worked solution and a mark scheme showing where the marks go.